JPS58100635A - Continuous annealing device - Google Patents

Abstract

PURPOSE:To provide a continuous annealing device by which a good overaging treatment free from stress aging is obtained in an overaging zone by providing a house looper which permits traveling of a steel strip while the strip is kept wound like loose coils in the overaging zone. CONSTITUTION:A strip 2 subjected to a quick cooling treatment 8 is fed to an overaging zone 9A, where the strip is heated to adequate temp.; thereafter the strip is delivered to a final cooling zone 10. In the zone 9A, the strip 2 is passed through the same while the strip is kept wound like loose coils by a house loopper 20 installed thereon. More specifically, the strip 2 in a horizontal state introdued into the zone 9A is raised perpendicularly by twisting rolls 21 on the inlet side and is conducted to an upper table 23 via pinch rolls 22 on the inlet side under driving. The strip 2 is loosely coiled on the table 23 and the strip 2 coming out from the inner side thereof is passed through driving pinch rolls 24 by which the strip is bent to an S shape. With the winding direction thereof reversed, the strip is conducted to a lower table 25, and is loosely coiled on the table 25. Thereafter the strip 2 in this state is delivered toward a cooling zone 10.

Description

[Detailed description of the invention] The present invention relates to a continuous annealing device.

FIG. 1 is a layout diagram showing a continuous annealing apparatus that has been put into practical use recently, and the strip 2 sent out from the coil unwinding machine 1 is connected to the input side equipment 3. After passing through the inlet looper 4, the heating zone 5. Soaking zone 6. Annealing zone 1° rapid cooling device 8. Overaging treatment zone 9
and final cooling? ! After being annealed in an annealing furnace consisting of F10, the exit looper 11. After passing through the outlet equipment 12, it is wound up into a coil in a winder 13.

The rapid cooling device 8 in the conventional continuous annealing apparatus described above uses gas cooling, roll cooling, mist cooling, water quenching, etc.
S) The IJ tube 2 is rapidly cooled at a predetermined cooling rate, but in any case, due to this rapid cooling process, the carbon in the steel is not sufficiently precipitated as carbide, and the amount of solid solution carbon increases.
Disadvantageous phenomena occur in terms of material properties, such as an increase in yield point, decrease in total elongation, and increase in aging properties. Therefore, a 94 VC over-aging treatment section 9 is provided at the beginning of the quenching device 8, and in the over-aging treatment tS, solid solution carbon is precipitated as carbide by keeping the strip 2 at a low temperature, thereby improving the material quality. The running length of this over-aging treatment zone 9 is determined by the over-aging treatment time of 2
min~5m1n, and the threading speed is, for example, 150m.
/min, the distance is 300m to 750m.

Therefore, in the conventional overaging treatment zone 9, the passing direction of the strip 2 is turned using a hearth roll, and this is repeated to pass the long strip 2 in a relatively short furnace. It is possible to accommodate.

However, in the overaging treatment zone 9 using the hearth rolls, at the point when the strip 2 turns in direction, it is bent to a certain curvature by the hearth rolls, and as a result, stress is applied, and the Depending on the furnace temperature, significant material hardening may occur due to stress aging. Although this material hardening can be used as a desirable phenomenon when trying to produce a hard material, it is a phenomenon that should be avoided when trying to obtain a soft material.

The material hardening due to stress aging occurs as follows. That is, if the Young's modulus of the strip 2 is E, its plate thickness ftd, bending diameter tD, and tension t-T for transferring the strip 2, then the maximum stress σ generated in the strip 2 is given by the following equation (1). It will be done.

σ= ET5+ T ・−・・・・・・・・・・・・
·······················song·
(1) Generally, since the tension T is 21#/- or less, the stress σ is dominated only by the first term on the right side. When this stress a is generated, a proliferation of dislocations and a subtle sliding movement commensurate with this stress occur inside the strip 2. Therefore, passing through the above direction turning point is quenching aging.
When strain aging is carried out in a temperature range where strain aging occurs, the dislocations multiplied by the bending stress generated at the direction turning point are fixed by the solid solution carbon that has diffused in a short time and pass through the direction turning point, Even if most of the stress is removed, these dislocations cannot disappear because they are no longer capable of sliding motion, and they remain as they are.

This phenomenon is repeated every time the material passes through a direction turning point, and the number of dislocations fixed by the solid solution carbon increases, resulting in the material becoming significantly hardened.

Therefore, when a hearth roll is used for the over-aging treatment zone 9, at the time when the strip 2 is rotated by the hearth roll, the over-aging effect of the strip 2 is not reduced due to the progress of stress aging. It is necessary to select the appropriate hearth roll diameter for the plate thickness.

In addition, in the above-mentioned conventional continuous annealing apparatus, even if a hearth roll is used for the overaging treatment 11F9 and the IJ tag is passed by repeatedly folding back, there is a limit to the miniaturization of the overaging treatment zone 9. There is. In addition, in the conventional continuous annealing apparatus described above, the entrance looper 4
A vertical or horizontal type is used as the exit looper 11, but in any case, in order to increase the amount of accumulated strip 2, it is necessary to increase the height or length of the looper equipment. That thing is getting longer.

The present invention has been made in view of the above conventional facts,
It is an object of the present invention to provide a continuous annealing device that can obtain a good overaging effect without causing stress aging in the overaged zone, and can increase the steel strip accommodation rate for a 2-inch length.

In order to achieve the above object, a continuous annealing apparatus according to the first aspect of the present invention is provided with an overaging treatment zone (an over-aging treatment zone) that allows the copper strip to pass through the copper strip while being wound in a loose coil shape. Further, the continuous annealing apparatus according to the second aspect of the present invention is provided with an inlet side looper and an outlet side looper on the inlet side and an outlet side, which allow the copper strip to be accumulated while being wound in a loose coil shape. The over-aging treatment band is provided with a 1-meter looper (which allows the sheet to pass while the copper band is wound in a loose coil).

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a layout diagram showing a first embodiment of the present invention, and the same parts as in FIG. Moreover, FIG. 3 is a plan view showing the No. 1 looper used in the first embodiment,
Figure 4 is its @ side view, and Figure 5 is its perspective view.

The strip 2 that has been quenched by the quenching device 8 enters an overaging treatment '\i9A, where it is heated to an appropriate temperature for the overaging treatment for a predetermined heat treatment time, and then sent to the final cooling zone 10. This over-aging treatment band 9A is provided with a sluice bar 20, which allows the strip 2 to be threaded while being wound into a loose coil. That is,
The IJ tube 2 in a horizontal state introduced into the overaging treatment zone 9A is raised vertically by the entry side twisting roll 21,
The driven entry side pinch roll 22 is guided to the upper table 23 by a light guide. The strip 2 forms a loose coil on the upper table 23, and the strip 2 emerging from the inside of the loose coil is bent into an S-shape by passing through a driven central pinch roll 24t, and the winding of the strip 2 is When the direction is reversed, it is guided to the lower cheagle 25 and forms a loose coil on the lower table 25.

The strip 2t/'i flows from the inside to the outside on the lower table 25 and exits from the exit vinci roll 26. It passes through the exit side twisting roll 27, becomes horizontal again, and is sent out toward the final cooling zone 10 as a subsequent process. The outer surfaces of the loose coils wound on the upper and lower tables 23, 25 are supported from their sides, for example, by guide rolls shown at 41 in FIG. 3.

Further, the inner surface of the loose coil is also supported by a support device (not shown).

Here, the state 111C in which the strip 2 is passed through the house looper 20 will be explained. The width W of the strip 2 was 1000-K, the thickness was 0.8 m, the line speed was 200 m/min, the overaging time was 2 to 5 m1n,
If the maximum bending radius R of the strip 2 determined by the external dimensions of the upper table 23 and lower table 25 of the house looper 20 is 2000-, then the house looper 20
The winding thickness d of the loose coil as shown in FIG. 6 is 10 m+g to 30 g from equation (2) below.

r((2000X10"-')2-(2000X10-
1-dXlo-')21X100OX10''X7.
6X2= 200X(2~5)X102X0.8X10
-”X100OX10-X7.6 ・・・−・・・・
...Track...Track...Track...Track...Track...List (2) Therefore, there is an on inside the house looper 20.
The minimum bending radius R1 of Le x Trip 2 is 1970-~19
It becomes 80 degrees. That is, the ratio of the thickness d of the strip 2 to the bending diameter DK in the over-aging zone 9A is sufficiently small, and stress aging does not occur in the strip 2 in such an over-aging zone 9A. It is recognized that

Next, once installed in the house looper 201, the furnace dimensions of the overaging treatment zone 9A as shown in FIG. 7 are compared with the furnace dimensions of the overaging treatment zone 9 according to the conventional example as shown in FIG. alt8. Here, the width W of the strip 2 is 1000 mm.
The plate thickness is 0.8 mm, the line speed is 200 m/min, and the overaging time is 2 min to 5 min. First, regarding the overaging treatment zone 9A, the maximum bending radius R of the strip 2 within the house looper 20 is l m.

Therefore, the outer radius of the furnace is L t-3m, and the height of the furnace is H1.
If it is 75 m, the hearth area SAl and the furnace surface area SA2 are:
The values are shown in the following (Equation 81 and Equation (4)), respectively.

SA, = π x 3” = 2 & 3 (-) ・・・・−・
・・・・・・・・・・・・・・・・・・・・・・・・・ ・・ ・・・・・・・
”x2+2πX3X5=15α7(-)・・・・・・(
4) On the other hand, regarding the overaging treatment zone 9 according to the conventional example, the ninth
As shown in the figure, the diameter of the hearth rolls 14 is 800 mm, and the pitch between adjacent hearth rolls 14 is Pt16.
00- and the height of the furnace bt-15-, the length a of the furnace is a value shown by the following equation (6).

200X (2~5) 1 = 'T5x2' X 1.6 = 21.3~5
33 (Cumulative)・・・・・・(6) Accordingly, the hearth area sB1 and the furnace surface area SB2 of the overaging treatment zone 9 are calculated by the following equations (6) and (7), respectively. The value is shown by .

5Bl= (21,3~543)X2=416~106
．． 6(-”)−−−−−・−+6)SB2=2((2
1,3~53.3)X2+(21,3~53.3)X1
5+15X2)=794~1872(-”)...-
・・・・・・・・・・・・・・・・・・・・・・・・・・・
...(7) From the above, the hearth area ratio and 1 surface area ratio of the overaging treatment zone 9A according to the above embodiment to the overaging treatment zone 9 according to the conventional example are calculated by the following formula (8) and ( 9) The value is given by Eq.

That is, according to the overaging treatment zone 9A according to the above embodiment in which the house looper 20 is installed, the floor area is reduced to 30% to 70% of the conventional example, and the surface area is reduced to 10% to 20% of the conventional example. B) It becomes possible to obtain sufficient heat treatment time required for the IJ tube 2.

FIG. 10 is a layout diagram showing a second embodiment of the present invention.

This second embodiment differs from the first embodiment described above in that an inlet looper 4A and an outlet looper 4A are provided on the inlet and outlet sides of the annealing furnace to allow the strip 2 to be stored while being wound in a loose coil. This is because the side looper 11A is provided.

These inlet side looper 4A and outlet side looper 11A are connected to the house looper 2 in which the overaging treatment zone 9AK is installed.
Therefore, the IJ tube accumulation effect will be explained with reference to FIG. 5. That is,
The central pinch roll 24 is disposed on a rotary table 28, and the rotary table 28 remains stationary while the inlet speed of the loose coil on the upper table 23 and the outlet speed of the loose coil on the lower table 25 are equal. ing. When the loose coil on the upper table 23 is wound clockwise and the inlet speed becomes faster than the outlet speed, the rotary table 28 starts to rotate clockwise, and as the rotary table 28 makes one revolution, By adding a turn to the upper and lower loose coils, the result is that strip 2 is stored. Next, if the input side speed is lower than the output side speed, the rotary table 28 starts rotating to the left, causing the rotary table 28 to rotate once again, and removing the windings of the upper and lower loose coils. As a result, when the stored friend strip 2 is supplied to the punching hole 11, it becomes . Here, the rotary table 28 has the function of controlling the increase and decrease of the IJ tube 2 and the smooth flow of the strip 2 from the upper loose coil to the lower loose coil. Therefore, the rotation speed and rotation direction of the rotary table 28 are driven and controlled in accordance with the speeds of the input side and the output side of the strike IJ tube 2.

According to the second embodiment, in addition to the effects of the first embodiment, the inlet looper 4A and the outlet looper 11At provided on the inlet and outlet sides of the annealing furnace are downsized, and the strip 2 is smaller than the line length. It becomes possible to increase the storage capacity.

I! FIG. 11 is a plan view showing a modification of the looper shown in FIGS. 3 to S used in each of the above embodiments, and FIG. 12 is a front view thereof. The looper 30 according to this modification includes the entrance twisting roll 21. A central roller 31 spirally winds the strip 2 introduced from the input pinch roll 22 at the center, and a central roller 31 winds the strip 2 fed from the central roller 31 into a loose coil from the inner circumferential side to the outer circumferential side. After winding, the exit side vinci roll 26 and the exit side twist roll 2
7* and a table 32 that allows two strips to be sent out. That is, according to the looper 30, as in the looper 20, the strip 2tl-
It is possible to pass through the IJ tube in a loose coil shape, with large bends under the radius, and to allow long strips to pass through and accumulate IJ tubes.

As described above, according to the continuous annealing apparatus according to the first aspect of the present invention and the continuous annealing apparatus according to the second aspect of the present invention, it is possible to obtain a good overaging effect in terms of overaging treatment strain, and also to increase the line length. This has the effect that it is possible to increase the steel strip accommodation rate.

[Brief explanation of the drawing]

Figure 1 is a layout diagram showing a conventional continuous annealing device;
The figure is a layout diagram showing the first embodiment of the present invention, and FIG.
Plan view showing the house looper used in the example, No. 4
The figure is a side view showing the same house looper, Fig. 5 is a perspective view showing the same house looper, Fig. 6 is a model diagram showing the whole loose coil in the same house looper, and Fig. 7 is the same @1 embodiment. Fig. 8 is a perspective view showing the general outline of the over-aging band in the conventional example, and Fig. 9 is a perspective view showing the general outline of the over-aging band in the conventional example. 10 is a layout diagram showing a second embodiment of the present invention, FIG. 11 is a plan view showing a modified example of the looper used in the present invention, and FIG. 12 is a side view showing the same looper. . 2...Strip, 4A...Inlet side looper, 9
A°...Overaging treatment zone, 11A... Output side looper,
201 house louver. Agent Patent Attorney Osamu Shiokawa Figure 1. 20 Figure 4 Figure 5 0 ＼ Figure 6 171 A Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (2)

[Claims] (1) A continuous annealing device equipped with a house louver in the over-aging treatment zone that allows the copper strip to be threaded while being wound into a loose coil. (2) Inlet and outlet louvers are provided on the inlet and outlet sides to allow accumulation when the copper strip is wound in a loose coil shape, and storage is allowed to accumulate under the condition in which the copper strip is wound in a loose coil shape. Continuous annealing equipment equipped with a house louver in the over-aging treatment zone that allows the sheet to be heated.